Made of high quality Niti Alloy●Products in good flexibility,high quality cutting efficiency and fracture resistance●Progressive taper design improves flexibility and cutting efficiency,especially in tighter or more curved canals●Recommended ritary speed of Engine Files is 250~350r/Min●With triangle cross section●With fixed plastic washer and handle●High-temperature sterilization is allowable●Packed with 6 files per box,available of single or assorted sizes